Baxi Combi 80E leak

wijcc · 2 Jul 2015

My Baxi boiler is leaking small amounts of water (dripping), it seems to be leaking at the back of the DHW pressure differential value and where the grub screws go on. I have included a pic and page from the manual of the boiler, with arrows point to where the drips are forming (see below).
Any suggestions as to what is causing the leaking of water and what i need to do to stop it please?

Thanks in advance guys

Crystalclear · 2 Jul 2015

wijcc · 2 Jul 2015

Thanks..

oh yes i forgot to and should have added that I replaced the diaphragm, pin and nut about a year or so ago as there was another leak

as in this post:
//www.diynot.com/diy/threads/baxi-combi-80e-leaking-water.343395/

The dripping has only started again a couple of weeks ago... after installing the new diaphragm i monitored it for a few weeks to make sure there was no leaks - there was none at that time

Could the diaphragm gone again so quickly?

Thanks again

Crystalclear · 2 Jul 2015

You welcome.

So your maintenance work stopped the leak since, a year ago? Wear and tear on a rubber product is
generally depending on the quality of the product?

I'm googling around, but no result yet...

Terry7556 · 2 Jul 2015

Replace valve body. Seem to recall removing l/h side panel to get at the grub screws on that side

gas112 · 2 Jul 2015

http://www.ebay.co.uk/itm/Baxi-Comb...466?pt=LH_DefaultDomain_3&hash=item4d20ec5ae2

.
No need for the whole body to be changed just change the castlated nut and the pin that comes through it , and at back of diaphragm housing there is a small nut that comes off and there is an o ring in the pack that goes in there

Agile · 2 Jul 2015

If pressure going down then its the fancy nut. You can get them on their own. But you must ensure the spindle is totally clean otherwise the new seal will spoil quickly.

But if pressure not going down its the tiny "O" at the back of the diaphragm assembly.

Neither are the easiest job but it depends a lot on the available access particularly from underneath.

Tony

45yearsagasman · 2 Jul 2015

30 minutes work. Old post

wijcc · 2 Jul 2015

the pressure is fine on the boiler... not had any problems with the boiler other than the this and the previous leak.

This is the kit i used on the previous repair..
http://www.ebay.co.uk/itm/Baxi-Comb...c5&clk_rvr_id=859745966637&afsrc=1&rmvSB=true

Thanks again for your help guys

wijcc · 2 Jul 2015

is the o ring that you guys are referring to the one in the pic below please?

45yearsagasman · 2 Jul 2015

Yes, that's the one that fits the rear seal of the DHW housing. Remove the hex nut, prize the old one out and fit new seal. This is best done with the diaphragm housing stripped down. Cleaning the pushrods is vital.

wijcc · 3 Jul 2015

thanks... so i basically do what i did before when the leak as at the pushrod end.. get the same kit and replace the same parts essentially?

here is the kit i used before:

http://www.ebay.co.uk/itm/Baxi-Comb...ue&clk_rvr_id=860275030504&afsrc=1&rmvSB=true

Or can i just buy the o ring separately

Also where does the o-ring go... position 1, 2, 3 or 4 on the pic below please?

Thanks again for all your help guys it is much appreciated

Agile · 3 Jul 2015

Not shown!

Its on the right hand side of the most right hard part !

Tony

wijcc · 3 Jul 2015

so it goes outside the DHW pressure differential value?? Position 5 on the updated pic?

Your help is much appreciated

Agile · 4 Jul 2015

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Baxi Combi 80E leak

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